I had a 2000 CFM Mr. Gasket fan on my '51, it has a '97 Dodge EFI 360, and in stock trim, that setup is good for 230 HP. Mine has some mods, nothing crazy, but its definitely more powerful than stock, probably 30-40 HP more). I never had any overheating issues, even sitting in traffic in the middle of July. The Mr. Gasket finally bit the dust, so I upgraded to a Permacool rated at 2,950 CFM. Haven't had it out in any kind of warm weather yet, but I'm sure it'll be even better. Like Dave said, free is free, if it doesn't work, just sell it.